Random-phase approximation study of collective excitations in the Bose-Fermi mixed condensate of alkali-metal gases
Random-phase approximation study of collective excitations in the Bose-Fermi mixed condensate of alkali-metal gases
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DOI：
10.1103/physreva.66.013618
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发表时间：
2002-02
影响因子：
2.9
通讯作者：
T. Sogo;T. Miyakawa;Toru Suzuki;H. Yabu
中科院分区：
文献类型：
--
作者：
T. Sogo;T. Miyakawa;Toru Suzuki;H. Yabu
在无规相位近似下研究了碱金属原子玻色-费米混合简并气体在T=0.计算是通过对角化在一个模型空间组成的粒子-空穴型激发从基态，后者是从耦合的Gross-Pitaevskii和Escheras-Fermi方程。我们研究了玻色和费米多极（L）算符的不同组合（L= 0，1，2，3）的强度分布。跃迁密度和动力学结构因子计算集体激发。与求和规则预测的集体频率的比较。研究了系统在外加脉冲作用下的时变行为。
We perform a random-phase approximation study of collective excitations in a Bose-Fermi mixed degenerate gas of alkali-metal atoms at $T=0.$ The calculation is done by diagonalization in a model space composed of particle-hole type excitations from the ground state, the latter being obtained from the coupled Gross-Pitaevskii and Thomas-Fermi equations. We investigate strength distributions for different combinations of Bose and Fermi multipole (L) operators with $L=0,1,2,3.$ Transition densities and dynamical structure factors are calculated for collective excitations. A comparison with the sum rule prediction for the collective frequency is given. The time dependent behavior of the system after an external impulse is studied.